JavaScript Zdobądź pierwszy znak ciągu
var str="Hello Folks!"
var firstStringChar = str.charAt(0); //H
Grepper
var str="Hello Folks!"
var firstStringChar = str.charAt(0); //H// The charAt() method returns the character at a specified index (position) in a string.
// The index of the first character is 0, the second 1, ...
// The index of the last character is string length - 1
let text = "HELLO WORLD";
let letter = text.charAt(0); // H
let text = "HELLO WORLD";
let letter = text.charAt(1); // E
let text = "HELLO WORLD";
let letter = text.charAt(text.length-1); // Dlet str = new String("This is string");
console.log("str.charAt(0) is:" + str.charAt(0));
console.log("str.charAt(1) is:" + str.charAt(1));
console.log("str.charAt(2) is:" + str.charAt(2));
console.log("str.charAt(3) is:" + str.charAt(3));
console.log("str.charAt(4) is:" + str.charAt(4));
console.log("str.charAt(5) is:" + str.charAt(5));
output:
str.charAt(0) is:T
str.charAt(1) is:h
str.charAt(2) is:i
str.charAt(3) is:s
str.charAt(4) is:
str.charAt(5) is:imyString = "Hello World!";
console.log(myString.charAt(0)); // outputs "H"
console.log(myString.charAt(5)); // outputs " "
console.log(myString.charAt(8)); // outputs "r"
/* If the specified index is bigger or equal to the length of the string
the output will be "". */
console.log(myString.charAt(23)); // outputs ""const str = 'Hello';
str.substring(0, 2); // => 'Hel'// You use this method to retrieve the character at a specified position in a string. Using this method,
// we can retrieve the first letter in a word:
const word = "freecodecamp"
const firstLetter = word.charAt(0)
// f